<template>
	<div>
		<!-- 面包屑导航区域 -->
		<el-breadcrumb separator-class="el-icon-arrow-right">
			<el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
			<el-breadcrumb-item>商品管理</el-breadcrumb-item>
			<el-breadcrumb-item>参数列表</el-breadcrumb-item>
		</el-breadcrumb>
		<!-- 卡片视图区 -->
		<el-card>
			<!-- 警告区域 -->
			<el-alert title="注意: 只允许为第三季分类设置相关参数!" type="warning" :closable="false" show-icon></el-alert>
			<!-- 选择商品分类区 -->
			<el-row class="cat_opt">
				<el-col>
					<span>选择商品分类：</span>
					<!-- 选择商品分类的级联选择框 -->
					<el-cascader :options="cateList" :props="cateProps" v-model="selectedCateKeys"
						@change="handleChange"></el-cascader>
				</el-col>
			</el-row>
			<!-- tab页签区 -->
			<el-tabs v-model="activeName" @tab-click="handleTabClick">
				<!-- 添加动态参数面板 -->
				<el-tab-pane label="动态参数" name="many">
					<!-- 添加参数的按钮 -->
					<el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数
					</el-button>
					<!-- 动态参数表格 -->
					<el-table :data="manyTableData" border stripe>
						<!-- 展开行 -->
						<el-table-column type="expand">
							<template slot-scope="scope">
								<!-- 循环渲染tag标签 -->
								<el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
								<!-- 输入文本框 -->
								<el-input class="input-new-tag" v-if="scope.row.inputVisible"
									v-model="scope.row.inputValue" ref="saveTagInput" size="small"
									@keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"></el-input>
								<!-- 添加按钮 -->
								<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+
									New Tag</el-button>
							</template>
						</el-table-column>
						<!-- 索引列 -->
						<el-table-column type="index"></el-table-column>
						<el-table-column lable="参数名称" prop="attr_name"></el-table-column>
						<el-table-column lable="操作">
							<template slot-scope="scope">
								<el-button size="mini" type="primary" icon="el-icon-edit"
									@click="showEditDialog(scope.row.attr_id)">编辑</el-button>
								<el-button size="mini" type="danger" icon="el-icon-delete"
									@click="removeParams(scope.row.attr_id)">删除</el-button>
							</template>
						</el-table-column>
					</el-table>
				</el-tab-pane>
				<!-- 添加静态属性面板 -->
				<el-tab-pane label="静态属性" name="only">
					<!-- 添加属性的按钮 -->
					<el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性
					</el-button>
					<!-- 静态属性表格 -->
					<el-table :data="onlyTableData" border stripe>
						<!-- 展开行 -->
						<el-table-column type="expand">
							<template slot-scope="scope">
								<!-- 循环渲染tag标签 -->
								<el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
								<!-- 输入文本框 -->
								<el-input class="input-new-tag" v-if="scope.row.inputVisible"
									v-model="scope.row.inputValue" ref="saveTagInput" size="small"
									@keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"></el-input>
								<!-- 添加按钮 -->
								<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+
									New Tag</el-button>
							</template>
						</el-table-column>
						<!-- 索引列 -->
						<el-table-column type="index"></el-table-column>
						<el-table-column lable="属性名称" prop="attr_name"></el-table-column>
						<el-table-column lable="操作">
							<template slot-scope="scope">
								<el-button size="mini" type="primary" icon="el-icon-edit"
									@click="showEditDialog(scope.row.attr_id)">编辑</el-button>
								<el-button size="mini" type="danger" icon="el-icon-delete"
									@click="removeParams(scope.row.attr_id)">删除</el-button>
							</template>
						</el-table-column>
					</el-table>
				</el-tab-pane>
			</el-tabs>
		</el-card>
		<!-- 添加参数的对话框 -->
		<el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
			<!-- 添加参数的验证表单 -->
			<el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
				<el-form-item :label="titleText" prop="attr_name">
					<el-input v-model="addForm.attr_name"></el-input>
				</el-form-item>
			</el-form>
			<span slot="footer" class="dialog-footer">
				<el-button @click="addDialogVisible = false">取 消</el-button>
				<el-button type="primary" @click="addParams">确 定</el-button>
			</span>
		</el-dialog>
		<!-- 修改参数的对话框 -->
		<el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
			<!-- 添加参数的验证表单 -->
			<el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
				<el-form-item :label="titleText" prop="attr_name">
					<el-input v-model="editForm.attr_name"></el-input>
				</el-form-item>
			</el-form>
			<span slot="footer" class="dialog-footer">
				<el-button @click="editDialogVisible = false">取 消</el-button>
				<el-button type="primary" @click="editParams">确 定</el-button>
			</span>
		</el-dialog>
	</div>
</template>

<script>
	export default {
		data() {
			return {
				// 商品分类列表
				cateList: [],
				// 级联选择框的配置对象
				cateProps: {
					value: 'cat_id',
					label: 'cat_name',
					children: 'children',
					expandTrigger: 'hover',
				},
				// 级联选择框双向绑定到的数组
				selectedCateKeys: [],
				// 被激活的页签名称
				activeName: 'many',
				// 动态参数的数据
				manyTableData: [],
				// 静态属性的数据
				onlyTableData: [],
				// 控制添加对话框的显示与隐藏
				addDialogVisible: false,
				// 添加参数的表单数据对象
				addForm: {
					attr_name: ''
				},
				// 添加表单的验证规则对象
				addFormRules: {
					attr_name: [{
						required: true,
						message: '请输入参数名称',
						trigger: 'blur'
					}]
				},
				// 控制修改对话框的显示与隐藏
				editDialogVisible: false,
				// 
				editForm: {},
				// 修改表单的验证规则对象
				editFormRules: {
					attr_name: [{
						required: true,
						message: '请输入参数名称',
						trigger: 'blur'
					}]
				},
			}
		},
		created() {
			this.getCateList()
		},
		methods: {
			// 获取商品分类数据
			async getCateList() {
				const {
					data: res
				} = await this.$http.get('categories')
				if (res.meta.status !== 200) {
					return this.$message.error('获取商品分类失败！')
				}
				// 把数据列表赋值给cateList数组
				this.cateList = res.data
			},
			// 级联选择框选中项变化，会触发这个函数
			handleChange() {
				this.getParamsData()
			},
			// Tab页签点击事件处理函数
			handleTabClick() {
				this.getParamsData()
			},
			// 获取参数的列表数据
			async getParamsData() {
				// 证明选中的不是三级分类
				if (this.selectedCateKeys.length !== 3) {
					this.selectedCateKeys = []
					this.manyTableData = []
					this.onlyTableData = []
					return
				}
				// 根据所选分类的id和当前所处的面板获取对应的参数
				const {
					data: res
				} = await this.$http.get(`categories/${this.cateId}/attributes`, {
					params: {
						sel: this.activeName
					}
				})
				if (res.meta.status !== 200) {
					return this.$message.error('获取参数列表失败！')
				}
				res.data.forEach(item => {
					item.attr_vals = item.attr_vals ?
						item.attr_vals = item.attr_vals.split(' ') : [],
						item.inputVisible = false
					item.inputValue = ''
				})
				if (this.activeName === 'many') {
					this.manyTableData = res.data
				} else {
					this.onlyTableData = res.data
				}
			},
			// 监听添加对话框的关闭事件
			addDialogClosed() {
				this.$refs.addFormRef.resetFields()
			},
			// 点击按钮添加参数
			addParams() {
				this.$refs.addFormRef.validate(async valid => {
					if (!valid) return
					const {
						data: res
					} = await this.$http.post(`categories/${this.cateId}/attributes`, {
						attr_name: this.addForm.attr_name,
						attr_sel: this.activeName
					})
					if (res.meta.status !== 201) {
						return this.$message.error('添加参数失败！')
					}
					this.$message.success('添加参数成功！')
					this.addDialogVisible = false
					this.getParamsData()
				})
			},
			// 点击按钮展示修改对话框
			async showEditDialog(attr_id) {
				this.editDialogVisible = true
				const {
					data: res
				} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {
					params: {
						attr_sel: this.activeName
					}
				})
				if (res.meta.status !== 200) {
					return this.$message.error('获取参数信息失败！')
				}
				this.editForm = res.data
			},
			// 监听修改对话框的关闭事件
			editDialogClosed() {
				this.$refs.editFormRef.resetFields()
			},
			// 点击按钮修改参数信息
			editParams() {
				this.$refs.editFormRef.validate(async valid => {
					if (!valid) return
					const {
						data: res
					} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
						attr_name: this.editForm.attr_name,
						attr_sel: this.activeName
					})
					if (res.meta.status !== 200) {
						return this.$message.error('修改参数失败！')
					}
					this.$message.success('修改参数成功！')
					this.getParamsData()
					this.editDialogVisible = false
				})
			},
			// 根据id删除对应的参数项
			async removeParams(attr_id) {
				const confirmResult = await this.$confirm('此操作将永久删除该分类, 是否继续?', '提示', {
					confirmButtonText: '确定',
					cancelButtonText: '取消',
					type: 'warning',
				}).catch(err => err)

				if (confirmResult !== 'confirm') {
					return this.$message.info('取消了删除！')
				}
				const {
					data: res
				} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
				if (res.meta.status !== 200) {
					return this.$message.error('删除参数失败！')
				}
				this.$message.success('移除参数成功！')
				this.getParamsData()
			},
			// 文本框失去焦点，或按下了enter键都会触发
			async handleInputConfirm(row) {
				if(row.inputValue.trim().length === 0) {
					row.inputValue = ''
					row.inputVisible = false
					return
				}
				// 如果没有return证明输入了正确内容
				row.attr_vals.push(row.inputValue.trim())
				row.inputValue = ''
				row.inputVisible = false
				// 发起请求保存这次操作
				this.saveAttrVals(row)
			},
			// 将对attr_vals的操作保存到数据库
			async saveAttrVals(row) {
				const {
					data: res
				} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
					attr_name: row.attr_name,
					attr_sel: row.attr_sel,
					attr_vals: row.attr_vals.join(' ')
				})
				if(res.meta.status !== 200) {
					return this.$message.error('修改参数项失败！')
				}
				this.$message.success('修改参数项成功！')
			},
			// 点击按钮，展示文本输入框
			showInput(row) {
				row.inputVisible = true
				// 让文本框自动获得焦点
				this.$nextTick(_ => {
					this.$refs.saveTagInput.$refs.input.focus()
				})
			},
			// 删除对应的参数和选项
			handleClose(i, row) {
				row.attr_vals.splice(i, 1)
				this.saveAttrVals(row)
			}
		},
		computed: {
			// 如果按钮需要被禁用，返回true
			isBtnDisabled() {
				if (this.selectedCateKeys.length !== 3) {
					return true
				}
				return false
			},
			// 当前选中的三级分类id
			cateId() {
				if (this.selectedCateKeys.length === 3) {
					return this.selectedCateKeys[2]
				}
				return null
			},
			// 动态计算标题的文本
			titleText() {
				if (this.activeName === 'many') {
					return '动态参数'
				}
				return '静态属性'
			}
		}
	}
</script>

<style lang="less" scoped>
	.cat_opt {
		margin: 15px 0;
	}

	.el-tag {
		margin: 10px;
	}

	.input-new-tag {
		width: 120px;
	}
</style>
